Switch to the rustup toolchain specification for Rust

flake.lock

@@ -1,12 +1,43 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1653893745,
+        "narHash": "sha256-0jntwV3Z8//YwuOjzhV2sgJJPt+HY6KhU7VZUL0fKZQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1680122840,
+        "lastModified": 1680498889,
-        "narHash": "sha256-zCQ/9iFHzCW5JMYkkHMwgK1/1/kTMgCMHq4THPINpAU=",
+        "narHash": "sha256-4nGFBm+oILOO6DPoKTPxVlfkZSxCOY4W25zSRHESK48=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a575c243c23e2851b78c00e9fa245232926ec32f",
+        "rev": "799d153e4f316143a9db0eb869ecf44d8d4c0356",
         "type": "github"
       },
       "original": {
@@ -15,19 +46,82 @@
         "type": "indirect"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1654275867,
+        "narHash": "sha256-pt14ZE4jVPGvfB2NynGsl34pgXfOqum5YJNpDK4+b9E=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "7a20c208aacf4964c19186dcad51f89165dc7ed0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "release-22.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pkgs-cargo2nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs_2",
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "lastModified": 1655189312,
+        "narHash": "sha256-gpJ57OgIebUpO+7F00VltxSEy6dz2x6HeJ5BcRM8rDA=",
+        "owner": "cargo2nix",
+        "repo": "cargo2nix",
+        "rev": "c149357cc3d17f2849c73eb7a09d07a307cdcfe8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cargo2nix",
+        "repo": "cargo2nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "nixpkgs": "nixpkgs",
+        "pkgs-cargo2nix": "pkgs-cargo2nix",
         "unstable": "unstable"
       }
     },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "pkgs-cargo2nix",
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "pkgs-cargo2nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1653878966,
+        "narHash": "sha256-T51Gck/vrJZi1m+uTbhEFTRgZmE59sydVONadADv358=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "8526d618af012a923ca116be9603e818b502a8db",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
     "unstable": {
       "locked": {
-        "lastModified": 1680125544,
+        "lastModified": 1680398059,
-        "narHash": "sha256-mlqo1r+TZUOuypWdrZHluxWL+E5WzXlUXNZ9Y0WLDFU=",
+        "narHash": "sha256-qtbKRe+pWuf5nNINdiCgn6EwOIQZxj0Ig/wybBpFNkQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9a6aabc4740790ef3bbb246b86d029ccf6759658",
+        "rev": "7c656856e9eb863c4d21c83e2601dd77f95f6941",
         "type": "github"
       },
       "original": {

flake.nix

@@ -4,9 +4,10 @@
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-22.11";
     unstable.url = "nixpkgs/nixos-unstable";
+    pkgs-cargo2nix.url = "github:cargo2nix/cargo2nix";
   };
 
-  outputs = { self, nixpkgs, unstable }:
+  outputs = { self, nixpkgs, unstable, pkgs-cargo2nix, ... }:
     let 
       version = builtins.string 0 8 self.lastModifiedDate;
       supportedSystems = [ "x86_64-linux" ];
@@ -16,6 +17,7 @@
         let
           pkgs = import nixpkgs { system = "x86_64-linux"; };
           pkgs-unstable = import unstable { system = "x86_64-linux"; };
+          cargo2nix = pkgs-cargo2nix.packages."x86_64-linux";
         in
         pkgs.mkShell {
           name = "ld-tools-devshell";

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.68.2"
+components = ["rust-src"]